Chasmocarcinus latipes Rathbun, 1898

Ng, Peter K. L. & Castro, Peter, 2016, Revision of the family Chasmocarcinidae Serène, 1964 (Crustacea, Brachyura, Goneplacoidea), Zootaxa 4209 (1), pp. 1-182: 22-23

publication ID

http://doi.org/10.11646/zootaxa.4209.1.1

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lsid:zoobank.org:pub:849BAB5C-464A-4B4A-A586-5742411EDC01

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http://treatment.plazi.org/id/F16BFB33-FFB6-FFED-FF6A-FE69FA4AFB8D

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scientific name

Chasmocarcinus latipes Rathbun, 1898
status

 

Chasmocarcinus latipes Rathbun, 1898 

( Figs. 1View FIGURE 1 E; 4A ‒E; 5D; 22A, B; 29C ‒E; 36E ‒H; 50A, C, D; 57A; 65A ‒D; 84E, F; 89E, F)

Chasmocarcinus latipes Rathbun, 1898b: 602  , pl. 43, fig. 5 [type localilty: Baja California, Mexico]; 1918: 5 [in key], 57, figs. 25, 26 [Baja California].— Crane 1937: 49, 75 [Baja California].— Garth 1948: 52 [Colombia, Ecuador]; 1961: 155 [El Salvador, Costa Rica, Panama].— Serène 1964a: 258 [in list].— Blow & Bailey 1992: 176 [in list].—Lemaitre & Álvarez León 1992: 55 [in list].— Hendrickx 1995: 139 [in list].—Ng et al. 2008: 76 [in list].—Vargas & Wehrtmann 2009: 195 [CD; in list].

Chasmocarcinus ferrugineus Glassell, 1936: 216  ; Crane 1937: 75, pl. 7 fig. 24 [Baja California].—Ng et al. 2008: 76 [in list].

Chasmocarcinus latipes  — Luke, 1977: 53 [in list].

cf. Chasmocarcinus  — Luke, 1977: 53 [in list].

Type material. Holotype female (12.4 × 14.4 mm) ( USNMAbout USNM 21592View Materials), Mexico, Baja California, Magdalena Bay , Albatross, stn 2833, 93 m, 2 May 1888. 

Other material examined. Mexico. 1 male, broken (cl 10.0 mm) ( LACMAbout LACM), E. Ángel de la Guarda I.  , Gulf of California, stn VSS-101, 20 m, 9.04.1959.—2 ovigerous females (14.0 × 16.0 mm, 11.8 × 14.1 mm), 1 male (13.2 × 16.4) ( MBPC 16356), Sebastián Vizcaíno Bay , Cedros I., 11.08.1952, J. Littlepage coll.; 2 ovigerous females (12.4 × 14.9 mm, 11.4 × 13.4 mm)  , 1 male (12.2 × 13.6) (MBPC16356), 74‒81 m.—CORTES 2: 2 males (EMU- 3474-B), off Santa Inez Bay , Gulf of California  , Baja California, El Puma , stn 49-B, 19.03.1995.— 1 male (9.9 × 13.5 mm) ( SIOAbout SIO C 320)  , Bahía Santa Inés  , Baja California, stn MV68- I-37, 26 °58’N, 110°40’W, 62 m, 41-feet otter trawl, C. Hubbs coll., T  . Washington, 14.01.1968; 3 males (largest 8.3 × 11.0 mm)  , 2 females (largest 9.4 × 11.6 mm) ( SIOAbout SIO C 319), Bahía de La Paz  , Baja California, stn MV68- I-29, 24 °25’N, 110°25’W, 82‒119 m, 40-foot otter trawl, C. Hubbs coll., T  . Washington, 12.01.1968.—TEMPLETON CROCKER’S EXPEDITION  : 1 female (holotype of Chasmocarcinus ferrugineus Glassell, 1936  ) (9.2 × 13.0 mm) (AMNH 16262), 1 female (paratype of Chasmocarcinus ferrugineus Glassell, 1936  ) (7.5 × 10.5 mm) ( AMNHAbout AMNH 16263View Materials), 5 miles southeast of Punta Arena , Gulf of California  , Baja California, stn 136, 23°29’N, 109°25'W, 81 m, dredge 21, 4-foot Blake dredge, Zaca, W. Beebe coll, 30.04.1936.— ALLAN HANCOCK EXPEDITION (1937)GoogleMaps  : 1 female ( MBPC 16358), Espíritu Santo I., Gulf of California, Velero III, stn 632-37  , 44 m.—BACANYON CRUISE: 1 male (7.2 × 9.7 mm) ( SIOAbout SIO C 1298), Cabo San Lucas , Baja California, stn 63, 22°52.9’N, 109°53.5’W, 110‒128 m, 15.02.1962GoogleMaps  .

Costa Rica. 1 female (6.6 × 8.5 mm) ( SIOAbout SIO C 1189), Golfo de Nicoya, stn MV68- I-96, 09 °27.3’N  ‒09°27.7’N to 84°30.1’W ‒84°31.3’W, 31 m, 25-foot otter trawl, Agassiz, C. Hubbs & S. Luke coll., 22 April 1973.

Panama. ALLAN HANCOCK EXPEDITION (1934): 1 female ( LACMAbout LACM), Bahía Honda, Velero III, stn 213-39, 55 m, 10.02.1934  .— EASTERN PACIFIC ZACA EXPEDITION: 1 female ( MBPC 16361), Gulf of Chiriquí, stn 221, D-4, 64 m, 13.03.1938  .

Colombia. ALLAN HANCOCK EXPEDITION (1938): 1 ovigerous female ( MBPC 16363), Puerto Utría, Velero III, stn 856-38, 37‒ 55 m, 25.02.1938. 

Ecuador. ASKOY EXPEDITION: 4 males (10.5 × 14.5 mm, 10.5 × 14.3 mm, 8.9 × 11.5 mm, 7.7 × 9.8 mm)  , 1 female (10.1 × 13.9 mm) (AMNH 1941-10668), stn 87, sample 344, 0 0°55’N, 80°08’W, 65‒98 m, 17.04.1941; 1 male (MBPC16360), stn 87, 0 1°07’N, 79°53’W, 36‒55 m, 17.04.1941.— ALLAN HANCOCK EXPEDITION (1934): 1 female ( MBPC 16368), Isla La Plata, Velero III, stn 231-34, 13‒ 18 m, 10.02.1934  .

Peru. 2 females ( MBPC 16359), off Talara, 94 m, shell and sand, E. M. del Solar coll., 1.09.1970. 

Diagnosis. Carapace ( Fig. 4View FIGURE 4 A ‒E) granular, with granular ridge along anterolateral margins, front nearly straight. Epistome ( Fig. 22View FIGURE 22 A, B) with subtriangular median lobe with median fissure, lateral margins slightly curved. Orbits long, eye peduncles proportionally long ( Fig. 22View FIGURE 22 A, B). Antennular articles relatively short ( Fig. 22View FIGURE 22 A, B). Third maxilliped ( Fig. 29View FIGURE 29 C ‒E) merus broadly ovate; ischium quadrate, about as long as merus.

Pterygostomial region gently convex, not bulging, not visible from dorsal view ( Fig. 5View FIGURE 5 D). Fingers of major chela of males ( Fig. 36View FIGURE 36 G) proportionally long, slightly longer than propodus in dorsal view; with small, short teeth. Fingers of minor  chela of both sexes ( Fig. 36View FIGURE 36 F, H) scissor-like; with small, sharp teeth. Inner margin of cheliped carpus ( Fig. 4View FIGURE 4 A ‒E; Rathbun 1918: fig. 25) with short, blunt tooth. Ambulatory legs ( Fig. 4View FIGURE 4 A ‒E) proportionally short, wide, stout; subdistal spur present on P5 dactylus. Fused thoracic sternites 1, 2 ( Fig. 50View FIGURE 50 A) broadly triangular, proportionally narrow, long. Male pleon ( Figs. 50View FIGURE 50 A, C, D, 57A) with low to high tubercle on distomedial margin of somite 6, telson proportionally long, narrow. G1 ( Fig. 65View FIGURE 65 A ‒C) stout, spinules along distal third. G2 ( Fig. 65View FIGURE 65 D) straight, slender, distal segment long, slightly curved; about 3/4 as long as G1. Female pleon ( Fig. 84View FIGURE 84 E, F) with lateral margins of somites strongly convex; telson proportionally short. Sterno-pleonal cavity of female ( Fig. 89View FIGURE 89 E, F) moderately shallow, vulvae relatively close together.

Remarks. Very characteristic and unique among congeners are the ambulatory legs of C. latipes  , being proportionally short and having conspicuously wide articles ( Fig. 4View FIGURE 4 A ‒E) as well as a subdistal spur on the P5. The pterygostomial region is gently convex but bulging in all congeners, and as such, not clearly visible from dorsal view ( Fig. 5View FIGURE 5 D). The lateral margins of the posterior margin of the epistome are slightly curved ( Fig. 22View FIGURE 22 A, B) but straight in Atlantic congeners.

The male pleonite 6 of all Chasmocarcinus  species often has the distal median part slightly convex. In some species, it is slightly more prominent and appears as a low subrectangular or obtuse tubercle (e.g., C. typicus  : Fig. 56View FIGURE 56 A). The tubercle of C. latipes  , however, is very pronounced and is clearly visible as a sharp tubercle ( Fig. 57View FIGURE 57 A). There is variation; it is lower in some specimens ( Fig. 50View FIGURE 50 C) or high ( Fig. 50View FIGURE 50 D); but is always distinct.

Glassell (1936) described Chasmocarcinus ferrugineus  on the basis of two females (one holotype) and male from Mexico; but no figures were provided. Garth (1948) was the first to suggest that Chasmocarcinus ferrugineus Glassell, 1936  , was a junior subjective synonym of C. latipes  , although he did not provide any figures as well. We have examined the holotype female (AMNH 16262) and the supposed paratype male (AMNH 16263) and agree with him that the two names are synonyms. The supposed paratype “male” specimen, however, is actually a young female.

Distribution. Tropical Eastern Pacific, from northern Gulf of California to northern Peru. Depth: 13‒ 128 m.

USNM

Smithsonian Institution, National Museum of Natural History

LACM

Natural History Museum of Los Angeles County

SIO

Scripps Institution of Oceanography

AMNH

American Museum of Natural History

Kingdom

Animalia

Phylum

Arthropoda

Class

Malacostraca

Order

Decapoda

Family

Chasmocarcinidae

Genus

Chasmocarcinus

Loc

Chasmocarcinus latipes Rathbun, 1898

Ng, Peter K. L. & Castro, Peter 2016
2016
Loc

Chasmocarcinus latipes

Luke 1977: 53
1977
Loc

Chasmocarcinus latipes

Hendrickx 1995: 139
Blow 1992: 176
Serene 1964: 258
Garth 1948: 52
Crane 1937: 49
Rathbun 1898: 602
1937
Loc

Chasmocarcinus ferrugineus

Crane 1937: 75
Glassell 1936: 216
1937